Entity Repo & Controller Refactor (#1690)

* Started mass-refactoring of the current entity repos

* Rewrote book tree logic

- Now does two simple queries instead of one really complex one.
- Extracted logic into its own class.
- Remove model-level akward union field listing.
- Logic now more readable than being large separate query and
compilation functions.

* Extracted and split book sort logic

* Finished up Book controller/repo organisation

* Refactored bookshelves controllers and repo parts

* Fixed issues found via phpunit

* Refactored Chapter controller

* Updated Chapter export controller

* Started Page controller/repo refactor

* Refactored another chunk of PageController

* Completed initial pagecontroller refactor pass

* Fixed tests and continued reduction of old repos

* Removed old page remove and further reduced entity repo

* Removed old entity repo, split out page controller

* Ran phpcbf and split out some page content methods

* Tidied up some EntityProvider elements

* Fixed issued caused by viewservice change

app/Actions/ViewService.php

@@ -1,6 +1,7 @@
 <?php namespace BookStack\Actions;
 
 use BookStack\Auth\Permissions\PermissionService;
+use BookStack\Entities\Book;
 use BookStack\Entities\Entity;
 use BookStack\Entities\EntityProvider;
 use DB;
@@ -44,7 +45,7 @@ class ViewService
         }
 
         // Otherwise create new view count
-        $entity->views()->save($this->view->create([
+        $entity->views()->save($this->view->newInstance([
             'user_id' => $user->id,
             'views' => 1
         ]));
@@ -60,7 +61,7 @@ class ViewService
      * @param string $action - used for permission checking
      * @return Collection
      */
-    public function getPopular(int $count = 10, int $page = 0, $filterModels = null, string $action = 'view')
+    public function getPopular(int $count = 10, int $page = 0, array $filterModels = null, string $action = 'view')
     {
         $skipCount = $count * $page;
         $query = $this->permissionService